Machine for clinching sheet metal of stove-boards



(N Model.)

W. WESTLAKE. MACHINE FOR GLIN'GHING SHEET METAL or STOVE BOARDS.

No. 542,071. Patented July 2, 1895.

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part or head of the frame A is rotatively- STATES WILLIAM WESTLAKE, or

BRooKLYN, NEW YORK.

MACHINE FOR CLINCHING SHEET METAL 0F STOVE-BOARDS.

SPECIFICATION forming part of Letters Patent No. 542,071, dated July 2, 1895.

Application filed January 11, 1395.

To all whom it ma y oonoern:

Be it known that I, WILLIAM WESTLAKE, a citizen of the United States, residing at Brooklyn, Kings county, New York, have invented certain new and useful Improvements in Machines for Olinching the Sheet Metal of Stove-Boards and the Like, of which the following is a specification.

This invention relates to a machine for use in the manufacture of stove-boards and the like, of sheet metal having a lining or backing of wood or similar comparatively-soft material, the metal being flanged to form a binding about thezedge of the lining, and its margin being turned or folded down upon the back of the lining.

The object of the invention is to provide a machine for the purpose of clinching down into the lining the edge of the sheet-metal flange turned over thereupon.

In the accompanying drawings I have shown a machine embodying the invention and adapted for use on a stove-board having a general rectangular form with rounded corners.

In said drawings, Figure 1 is a side elevation of the machine with the dies in vertical mid-section, and Fig. 2 is a front elevation of the upper part of the machine. Figs. 3 and 4 are respectively an under side view of the upper die and an upper side or plan view of the lower die. Fig. 5 is a fragmentary sectional View of the dies on a larger scale, illustrating the operation of the machine. The section is taken in a plane which bisects the rounded angle of the dies. Figs. 6 and 7 are fragmentary sectional views of a part of the stove-board, the former showing the board before the clinching operation and the latter showing it after the operation.

A represents a stout frame of any kind, but preferably of cast-iron. In Fig. 2 the base of this frame is omitted as not necessary for illustration. On the frame is a bracket B, which supports thelower die 0. In the upper mounted an eccentric shaft E, having on it a driving wheel or pulley F and an eccentric. To the eccentric is coupled in a well-known manner, a short connecting-rod b, which is coupled at its lower end to an upper die D,

which registers with the fixed lower die 0.

Serial No. 534,530- (No model.)

The upper die D has on it guides 0, (indicatedin'dotted lines,) which play in suitable guideways in the head as the die D is reoiprocated by the eccentric on the shaft.

As all of the mechanism for converting rotary motion of the shaft E into reciprocating motion of a die is old and well known, I have not deemed it necessary to illustrate it more in detail.

The upper and lower dies are of triangular form with one corner rounded, corresponding in this respect with one corner of the stoveboard, and having the same dimensions as the latter. The loweror stationary die 0 is provided with stops a, up to which the stove-- board is placed, when the margin of the latter will be in register with the margins of the dies.

Referring to Figs. 5, 6, and 7, x represents the sheet-metal stove-board, and y the wooden lining of the same. Before inserting the lining the margin of the board has a box-fiange turned on ithy appropriate mechanism, the

free edge at of said flange taking over the hack of the lining, as seen in Fig. 6, when the latter is in place. The purpose of the present machine is to clinch or drive this free edge as into the softer liningy all around the board, as indicated at z in Fig. 7. The effect of this is to draw the metal snuglyover the edge of the lining and to embed the edge of the flange 00'. To effect this object the lower die 0 is provided with a raised rib d, set at a uniform distance from'the edge of the die and conforming to the contour thereof by preference. This rib is somewhat triangular in cross-section, having a sharp knifeedge apex and concave sides, as clearly shown in Fig. 5.

The operation is as follows: The machine is set in motion, and when the upper die is elevated the attendant inserts between the dies a stove-board, in the condition seen in Fig. 6, with the metal sheet uppermost,pushing it up to the stops a. The free edge 00' of the flange on the sheet will now rest on the sharp rib'd on the lower die. per die descends, the rib d forces the metal of the flange into the backing or lining, as seen in Fig. 5. The upper die now rises and the attendant removes the board, turns it part Way round, and inserts another corner, four When the up ICU operations being required on each board. The straight sidesof the rib (I will be of such length as to extend a little more than halfway along the side of the stove-board, so that four operations of the dies will complete the clinching operation around the entire board.

Preferably the upper die D will be recessed at itscentral part, leaving only a raised triangular surface or part e to press upon the upper face of the board over the rib d.

The machine may have means forautomatically stopping the movement of the upper die at each rotation of the shaft F and a treadle Gfor setting the machine in motion; but such a device is in common use and I have not deemed it necessary to illustrate it.

I will say that While I have shown the die D as the moving die the die (J may be made the moving die. The advantage in making the upper die the plain die and also the moving die, is that it enables the attendant to place the board with its face uppermost on a fixed die and thus have it lie steady and immovable while being operated on, and it also enables him to avoid scratching or niarring the face. I prefer, also, to so place the machine that the moving die will follow about a vertical path; but this is not essential to good Work.

Having thus described my invention, I claim- In a machine for the purpose set forth, the combination with the stationary, supported die 0, of angular form provided with a knifeedge rib d which extends along the two straight sides of the die and about the rounded corner thereof at a uniform distance from the edge of the die, the guides a, fixed to the die 0 at its straight sides, and the upper, recip rocating die D, having the same contour as the die 0, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

WILLIAM WES'ILAKE. Witnesses:

PETER A. Boss, HENRY CONNETT. 

